Optical properties and chemical composition of PM2.5 in Shanghai in the spring of 2012--颗粒学报PARTICUOLOGY

Huang, G., Cheng, T., Zhang, R., Tao, J., Leng, C., Zhang, Y., Zha, S., Zhang, D., Li, X., & Xu, C. (2014). Optical properties and chemical composition of PM2.5 in Shanghai in the spring of 2012. Particuology, 13, 52–59. https://doi.org/10.1016/j.partic.2013.10.005

Guanghan Huang ^a, Tiantao Cheng ^a b *, Renjian Zhang ^c, Jun Tao ^d, Chunpeng Leng ^a, Yunwei Zhang ^a, Shuping Zha ^a, Deqin Zhang ^a, Xiang Li ^a, Chunyang Xu ^e

a Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China
b Fudan-Tyndall Centre, Fudan University, Shanghai 200433, China
c Key Laboratory of Region Climate-Environment Research for Temperate East Asia (RCE-TEA), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
d South China Institute of Environmental Sciences, Guangzhou 510655, China
e Jiangsu Suqian Meteorological Bureau, Jiangsu 202222, China

10.1016/j.partic.2013.10.005

Volume 13, April 2014, Pages 52-59

Received 6 April 2013, Revised 24 September 2013, Accepted 7 October 2013, Available online 25 December 2013.

E-mail: ttcheng@fudan.edu.cn

Highlights

• PM_2.5, aerosol optical coefficients, CCN activation were monitored in Shanghai during spring 2012.

• Organic matter, sulfate, nitrate, ammonium were major components of PM_2.5.

• Diurnal variations of aerosol optical coefficients had a typical bimodal pattern.

• Aerosol particle chemistry contributed significantly to CCN activation.

Abstract

The semi-diurnal mean aerosol mass concentration, chemical composition, and optical properties of PM_2.5 were investigated in Shanghai during the spring of 2012. Slight pollution was observed during the study period. The average PM_2.5 concentration was 64.11 ± 22.83 μg/m³. The mean coefficients of extinction, scattering, and absorption at 532 nm were 125.9 ± 78.5, 91.1 ± 56.3, and 34.9 ± 23.6 Mm⁻¹, respectively. A relatively low mean single scattering albedo at 532 nm (0.73 ± 0.04) and low level of elemental carbon (EC, 2.67 ± 1.96 μg/m³) suggested that the light absorption was enhanced due to the internal mixing of the EC. Sulfate contributed the most to aerosol light scattering in Shanghai. The chemical composition of PM_2.5was dominated by particulate organic matter, sulfate, nitrate, ammonium, and EC. Anthropogenic sources made a significant contribution to the emission and loading of the particulate pollutants. A relatively good correlation between the aerosol chemical composition and the cloud condensation nuclei (CCN) activation indicated that aerosol chemistry is an important factor that influences the saturated hygroscopicity and growth of the aerosol.

Graphical abstract

Keywords

PM_2.5; Chemical composition; Optical property

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